 <div class="form-group">
   <div class="input-group">
   <span class="input-group-btn">
       <div class="c-btn btn btn-default btn-lg" style="height:50px;" group="login">
  		<span class="glyphicon glyphicon-user"></span>
	</div>
     </span>
     <input type="input" class="form-control" id="username" placeholder="" style="height:50px;" group="login">
   </div><!-- /input-group -->
  </div> 